Rule 34 Dev - 2010s 2016 2boys animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller dark_background glowing hornyraptor humanoid humanoid_robot larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating mettaton mettaton_ex missionary_position penetration robot robot_humanoid sans sans_(undertale) sex skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom thrusting undead undertale undertale_(series) yaoi|9300485552

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